Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello, my name is***** usually means the pump has failed which has a built in regulator. Test the low pressure fuel pressure again, should average near 60 PSI. Test voltage drop across the fuel pump in the tank, Gray wire, pin D and Black wire, pin A. Should see near 13-14 V with engine running. If OK, replace the tank fuel pump, recheck operation. Here are replacement instructions, let me knwo if there is anything else I can do to help. Thanks.
It is in the tank pump but high pressure pump on engine is the most likely problem. So if low pressure tests good replace high pressure pump. Let me know how it goes or if you run into more questions, thanks.
Correct, also verify low pressure is good. Let me know how it goes, thanks.
It will be larger gray wire at pin D of connector. It is probably fine considering fuel pressure was 69 psi. Let me know how it goes, thanks.
The mass airflow sensor and oxygen sensor can also cause it to run rich. You can disconnect each to see if the black smoke stops, if so replace sensor. If not, continue with high pressure pump. Let me know, thanks.
No problem, let me know how it goes. You can order pump from www.rockauto.com to save money. Let me know if you have more questions, thanks.